Support Japanese keyboard (JIS keyboard)

Please implement Japanese(JIS keyboard) option in Keyboard layout setting.
For now, we can’t bind some keys e.g.":".
And double tapping “かな” key* doesn’t work which works on almost all other apps on Mac.

  • double tapping “かな” key ・・・We can re-convert typo by selecting words and
    then double tapping “かな” key on Mac.